gas tests

• TEST FOR CHLORINE

  place damp blue litmus paper in a gas cylinder containing sample

  litmus paper should turn from blue to white as it bleaches if chlorine is present
• TEST FOR OXYGEN

  glowing splint in gas cylinder

  splint re-lights
• HYDROGEN

  lit splint in gas cylinder

  squeaky pop as water is formed when the hydrogen reacts with oxygen
• CARBON DIOXIDE

  bubble gas sample through limewater and it turns cloudy as calcium carbonate is formed
• in the chlorine test, litmus paper can sometimes turn red before turning white as hydrochloric acid is formed